int、long、long long, double, long double取值范围

unsigned int 0～4294967295

int 2147483648～2147483647

unsigned long 0～4294967295

long 2147483648～2147483647

long long的最大值：9223372036854775807

long long的最小值：-9223372036854775808

unsigned long long的最大值：1844674407370955161

__int64的最大值：9223372036854775807

__int64的最小值：-9223372036854775808

unsigned __int64的最大值：18446744073709551615

1 #include

2 #include

3 #include

4 using namespace std;

5

6 int main()

7 {

8 cout << "type: \t\t" << "************size**************"<< endl;

9 cout << "bool: \t\t" << "所占字节数：" << sizeof(bool);

10 cout << "\t最大值：" << (numeric_limits::max)();

11 cout << "\t\t最小值：" << (numeric_limits::min)() << endl;

12 cout << "char: \t\t" << "所占字节数：" << sizeof(char);

13 cout << "\t最大值：" << (numeric_limits::max)();

14 cout << "\t\t最小值：" << (numeric_limits::min)() << endl;

15 cout << "signed char: \t" << "所占字节数：" << sizeof(signed char);

16 cout << "\t最大值：" << (numeric_limits::max)();

17 cout << "\t\t最小值：" << (numeric_limits::min)() << endl;

18 cout << "unsigned char: \t" << "所占字节数：" << sizeof(unsigned char);

19 cout << "\t最大值：" << (numeric_limits::max)();

20 cout << "\t\t最小值：" << (numeric_limits::min)() << endl;

21 cout << "wchar_t: \t" << "所占字节数：" << sizeof(wchar_t);

22 cout << "\t最大值：" << (numeric_limits::max)();

23 cout << "\t\t最小值：" << (numeric_limits::min)() << endl;

24 cout << "short: \t\t" << "所占字节数：" << sizeof(short);

25 cout << "\t最大值：" << (numeric_limits::max)();

26 cout << "\t\t最小值：" << (numeric_limits::min)() << endl;

27 cout << "int: \t\t" << "所占字节数：" << sizeof(int);

28 cout << "\t最大值：" << (numeric_limits::max)();

29 cout << "\t最小值：" << (numeric_limits::min)() << endl;

30 cout << "unsigned: \t" << "所占字节数：" << sizeof(unsigned);

31 cout << "\t最大值：" << (numeric_limits::max)();

32 cout << "\t最小值：" << (numeric_limits::min)() << endl;

33 cout << "long: \t\t" << "所占字节数：" << sizeof(long);

34 cout << "\t最大值：" << (numeric_limits::max)();

35 cout << "\t最小值：" << (numeric_limits::min)() << endl;

36 cout << "unsigned long: \t" << "所占字节数：" << sizeof(unsigned long);

37 cout << "\t最大值：" << (numeric_limits::max)();

38 cout << "\t最小值：" << (numeric_limits::min)() << endl;

39 cout << "double: \t" << "所占字节数：" << sizeof(double);

40 cout << "\t最大值：" << (numeric_limits::max)();

41 cout << "\t最小值：" << (numeric_limits::min)() << endl;

42 cout << "long double: \t" << "所占字节数：" << sizeof(long double);

43 cout << "\t最大值：" << (numeric_limits::max)();

44 cout << "\t最小值：" << (numeric_limits::min)() << endl;

45 cout << "float: \t\t" << "所占字节数：" << sizeof(float);

46 cout << "\t最大值：" << (numeric_limits::max)();

47 cout << "\t最小值：" << (numeric_limits::min)() << endl;

48 cout << "size_t: \t" << "所占字节数：" << sizeof(size_t);

49 cout << "\t最大值：" << (numeric_limits::max)();

50 cout << "\t最小值：" << (numeric_limits::min)() << endl;

51 cout << "string: \t" << "所占字节数：" << sizeof(string) << endl;

52 // << "\t最大值：" << (numeric_limits::max)() << "\t最小值：" << (numeric_limits::min)() << endl;

53 cout << "type: \t\t" << "************size**************"<< endl;

54 return 0;

55 }

一字节表示八位，即：1byte = 8 bit;

int: 4byte = 32 bit 有符号signed范围：2^31-1 ~ -2^31即：2147483647 ~ -2147483648无符号unsigned范围：2^32-1 ~ 0即：4294967295 ~ 0

long: 4 byte = 32 bit 同int型

double: 8 byte = 64 bit 范围：1.79769e+308 ~ 2.22507e-308

long double: 12 byte = 96 bit 范围： 1.18973e+4932 ~ 3.3621e-4932

float: 4 byte = 32 bit 范围： 3.40282e+038 ~ 1.17549e-038

int、unsigned、long、unsigned long 、double的数量级最大都只能表示为10亿，即它们表示十进制的位数不超过10个，即可以保存所有9位整数。而short只是能表示5位；

http://blog.csdn.net/tenlee/article/details/44997015